Title: The%20benefit%20of%20plant%20models%20for%20laser%20generated%20data%20-%20advantages%20of%20a%20symbiosis%20-%20%20Dipl.%20Inf.%20Stefan%20Paulus%20Institute%20of%20Geodesy%20und%20Geoinformation%20Professorship%20of%20Geodesy%20University%20of%20Bonn
1The benefit of plant models for laser generated
data- advantages of a symbiosis -Dipl. Inf.
Stefan PaulusInstitute of Geodesy und
GeoinformationProfessorship of
GeodesyUniversity of Bonn
2overview
- state of the art
- motivation
- problems and difficulties
- benefit of models
- perspective
3state of the art
- Laserscanning of plants
- with airborne laserscanners
- inertial system GPS
- with ground based laserscanner
- time of flight
- phase shift
- in the laboratory
- triangulation
- structed light
- with different geometric
- approaches
Omasa 2007
4state of the art
- Extraction of various parameters
- canopy height / mean tree height
- distribution of leaf area in space
- gap propability
- breast hight, diameter
- carbon stocks from biomass estimation
- shape analysis
Omasa 2007
Omasa 2007
Omasa 2007
Omasa 2007
Hosoi 2011
5state of the art
High resolution laser scanning of plants
6motivation
- today
- Derivation of morphological characteristics
- Sensor fusion with RGB/IR/hyperspectral camera
data - Reference system for calibration of other
sensors - Observation of smallest changes to quantify
plant response - to changes in environment
time
time
7motivation
- In future
- usage directly in the field
- target-actual comparison
- prediction of parameters due to environment
- adjustement of application and geometry
Interaction is needed here!
Volume dm³
time
Llorens 2011
8problems and difficulties
- Plant motion due to growth and vibrations
- Change of plant structure und arrangement
9problems and difficulties
- 3. Occlusion due to sensor range and structure
- Penetration of the laser beam and the plant
surface
Perceptron 2008
10benefit of models
- In short
- penetration ? improve the technique
- occlusion ? ???
- change in structure ? ???
- plant motion ? ???
- Benefit of physical (or FSPM) models
- coordinate system for the plant
- knowledge of structure
- independant from sensor
- connection between parts is known,
- this enables tracking
phyto-reference-system
11benefit of models
.
laserscans
model
12benefit of models
- resolution
- accuracy
- geometry
- deformation
- geometry
- parameters
- prediction
- structure
- connection
- interaction
- growth
- development
model
laserscans
high resolution plant puzzle aligned by
underlying grammar system
13benefit of models
- local data can be aligned to the whole structure
- by this, motion can be eliminated resp. is less
disturbing - different sensors like RGB or hyperspectral
camera can be - fused in a more accurate way
14The idea in short
- Laser penetration
- Occlussions
- Accuracy
- Resolution
- Errors
- Uncertainty
- no data
15The idea in short
Problems
Errors
Laserscans
Parameter
Pre-Model
Improved Parameters
Improved Laserdata
Model
16with an application
Reliability
17perspective
- better results for known techniques
- laserscanning under difficult circumstances
- parameter extraction under bad point cloud
conditions
18perspective
- better classification results for automated
classification
leaf / stem classification by using SVM
19questions?
Thanks for your attention. Feel free to ask!
20Abstract
- Laserscanning im Pflanzenbereich bietet höchste
Auflösungen bei gleichzeitiger nicht invasiver
Messung. Aus den resultierenden Punktwolken
lassen sich Parameter ableiten, aus denen der
Zustand der Pflanze bzgl. bspw. Trockenstress
hervorgeht. Probleme ergeben sich aus der
Eigenbewegung der Pflanze, der Dimension der
Deformation (Wachstum und äußere Einflüsse),
sowie einer unzureichenden 3D Zuordnung, die
Fusion verschiedener Sensoren und Teilscans sowie
Vergleich zu unterschiedlichen Zeitpunkten
erschweren. Pflanzenmodelle bieten hier Lösungen
durch Pflanzen-bezogene Koordinatensysteme, die
zeitlich und räumliche Zuordnungen ermöglichen. - Laserscanning of plants provides highly accurate
spatial resolution information together with
non-invasive measurements. The resulting point
cloud can be used to extract parameters
describing plant state changes in response to
i.e. drought stress. Problems resulting from
plant motion, dimension of deformation caused by
growth and outer influences as well as from
insufficient 3D correspondence of scan parts
among each other, complicates fusion of different
sensors and scan parts and also the comparison of
data of different dates. Plant models are
solutions to these problems by providing
plant-applied coordinate systems that enable
spatio-temporal registration.